TEAC FD-235HG-C805/C817/C897 MICRO FLOPPY DISK DRIVE SPECIFICATION

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TEAC FD-235HG-C805/C817/C897 MICRO FLOPPY DISK DRIVE

SPECIFICATION

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1. OUTLINE... 1

2. DISK ... 2

3. PHYSICAL SPECIFICATION ... 3

4. OPERATIONAL CHARACTERISTICS... 5

4.1 2MB Mode Data Capacity ... 5

4.2 1.6MB Mode Data Capacity ... 6

4.3 1MB Mode Data Capacity ... 7

4.4 Disk Rotation Mechanism ... 7

4.5 Index Detection ... 8

4.6 Track Construction ... 8

4.7 Magnetic Head ... 8

4.8 Track Seek Mechanism... 9

4.9 Window Margin and Others... 9

5. ENVIRONMENTAL CONDITIONS... 10

6. RELIABILITY ... 11

7. POWER INTERFACE ... 12

7.1 Required Power ... 12

7.2 Power Interface Connector and Cable ... 13

8. SIGNAL INTERFACE... 15

8.1 Signal Interface Connector and Cable ... 15

8.2 Electrical Charactristics... 17

8.2.1 FDD side receiver and driver... 17

8.2.2 Host side receiver and driver... 17

8.3 Input/Output Signals... 19

8.3.1 DRIVE SELECT input signal ... 19

8.3.2 MOTOR ON input signal ... 19

8.3.3 DIRECTION SELECT input signal ... 19

8.3.4 STEP input signal... 19

8.3.5 WRITE GATE input signal... 19

8.3.6 WRITE DATA input signal ... 20

8.3.7 SIDE ONE SELECT input signal ... 20

8.3.8 TRACK 00 output signal... 20

8.3.9 INDEX output signal ... 20

8.3.10 READ DATA output signal ... 21

8.3.11 WRITE PROTECT output signal ... 21

8.3.12 DISK CHANGE output signal ... 21

8.3.13 READY output signal... 21

8.3.14 Input/Output sgnal for density mode setting (MODE SELECT)... 21

8.3.14.1 Method for switching the density mode between HIGH DENSITY and NORMAL DENSITY... 22

8.3.14.2 Method for switching the density mode between 2MB mode and 1.6MB mode... 22

8.3.15 NO CONNECTION (NC) ... 22

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9.2 Seek Operation ... 26

9.3 Read Write Operation ... 27

9.4 Current Consumption Profile... 28

10.FRAME GROUNDING ... 30

11.CUSTOMER SELECTABLE STRAPS... 31

11.1 Function Summary of Straps ... 31

11.2 DS0/DS1 ... 31

11.3 HA Strap ... 31

11.4 RY34/DC34 Straps ... 31

12.TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR ... 32

12.1 Front Bezel Indicator... 32

12.2 Spindle Motor... 32

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1. OUTLINE

This specification provides a description for the TEAC FD-235HG, triple density (2/1.6/1MB, 3-mode), 90mm (3.5-inch) micro floppy disk drive (hereinafter referred to as FDD). Table 1-1 shows the outline of the FDD, and Table 1-2 shows the signal interface pin-assignment.

(Table 1-1) Specification outline

Model name FD-235HG-C805 FD-235HG-C817 FD-235HG-C897

Front bezel Black Black Beige (PS)

Eject button Black Black Beige (PS)

LED indicator Green Red Green

Safety standard UL, CSA & TÜV (FD-235HG-C817 is not confirmed by TÜV.)

Operation modes 2MB mode

Write and read 1.6MB mode

Write and read 1MB mode Write and read 90mm (3.5-inch) disk used High density

(2HD)

High density

(2HD) Normal density

(2DD)

Unformatted data capacity 2M bytes 1.6M bytes 1M bytes

Data transfer rate 500k bits/s 500k bits/s 250k bits/s

Disk rotational speed 300rpm 360rpm 300rpm

Track density 5.3track/mm (135tpi)

Track to track time 3ms

Required power +5V single (4.5 ~ 5.5V) Signal output driver Open collector TTL Input signal pull-up 1kΩ ±5%, unremovable

Customer selectable strap 6 selections (DS0, DS1, RY34, DC34, HA, FG) Refer to item. 11.1

Function setting at delivery 1. Strap setting

1.1 DS0 : DRIVE SELECT 0 on pin 10 1.2 RY34 : READY on pin 34

1.3 HA : Automatic density setting for 2DD (1MB) disk or 2HD (2MB/1.6MB) disk.

1.4 FG : Frame is electrically shorted to DC 0V.

2. Other interface setting

2.1 Pin2 : MODE SELECT input (LOW: 1.6MB mode) 3. Other function setting

3.1 LED turn on condition: DRIVE SELECT 3.2 Motor rotating condition: MOTOR ON

3.3 Ready and seek-complete gate (full-mask) for INDEX and READ DATA output pulses.

3.4 Auto-chucking at disk installation 3.5 Equipped with auto recalibration Interface connector 34 pin right-angled header connector

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The FDD is equipped with a discrimination switch for the high density (HD) hole of an installed disk cartridge.

Refer to item. 8.3.13 as to the detailed explanation for density mode setting.

2. DISK

(1) Work disk

90mm (3.5-inch) micro floppy disks which are mutually agreed between the customer and TEAC.

For 2MB mode : High density disk (2HD) 1.6MB mode : High density disk (2HD) 1MB mode : Normal density disk (2DD) (2) Cleaning disk

The FDD does not require any cleaning disk. However, the dry type disk which is mutually agreed between the customer and TEAC is used when requiring a cleaning disk.

(Table 1-2) Signal interface pin-assignment

Pin Nos. Signals Pin Nos. Signals Direc

1 0V 2 MODE SELECT Input

3 0V 4 NC 

5 0V 6 NC 

7 0V 8 INDEX Output

9 0V 10 DRIVE SELECT 0/OPEN Input

11 0V 12 DRIVE SELECT 1/OPEN Input

13 0V 14 NC 

15 0V 16 MOTOR ON Input

17 0V 18 DIRECTION SELECT Input

19 0V 20 STEP Input

21 0V 22 WRITE DATA Input

23 0V 24 WRITE GATE Input

25 0V 26 TRACK 00 Output

27 0V 28 WRITE PROTECT Output

29 0V 30 READ DATA Output

31 0V 32 SIDE ONE SELECT Input

33 0V 34 DISK CHANGE/READY Output

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3. PHYSICAL SPECIFICATION

(Table 3-1) Physical specification

Width 101.6mm (4.00 in), Nom.

Height 25.4mm (1.00 in), Nom.

Depth 145mm (5.71 in), Nom., excluding front bezel Weight 410g (0.90lbs), Nom., 415g (0.91 lbs), Max.

External view See Fig. 3-1.

Cooling Natural air cooling

Mounting Mountings for the following directions are acceptable.

(a) Front loading, mounted vertically.

(b) Front loading, mounted horizontally with spindle motor down.

(c) Mounting angle in items (a) and (b) should be less than 25° with front bezel up or down.

Note: As to the other mounting directions than the above will be considered separately.

Installation With installation holes on the frame of the FDD. Refer to Fig. 3-1.

Material of frame Sheet Metal.

Material of front bezel PPHOX (Complying with UL94-5V) ABS

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4. OPERATIONAL CHARACTERISTICS

4.1 2MB Mode Data Capacity

(Table 4.1-1) 2MB mode data capacity

Recording method FM MFM

Data transfer rate k bits/s 250 500

Tracks/disk 160 160

Innermost track bit density bpmm 343.19 686.38

Innermost track flux density fcpmm 686.38 686.38

Data capacity

Unformatted k bytes/track 6.25 12.5

k bytes/disk 1,000 2,000

32 sectors/track

k bytes/sector 0.128 0.256

k bytes/track 4.096 8.192

k bytes/disk 655.36 1,310.72

18 sectors/track

k bytes/disk 737.28 1,474.56

10 sectors/track

k bytes/disk 819.2 1,638.4

Formatted

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4.2 1.6MB Mode Data Capacity

(Table 4.2-1) 1.6MB mode data capacity

Tracks/disk 160 160

Data capacity

k bytes/disk 833.28 1,666.56

26 sectors/track

k bytes/disk 532.48 1,064.96

15 sectors/track

k bytes/disk 614.4 1,228.8

8 sectors/track

k bytes/disk 655.36 1,310.72

Formatted

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4.3 1MB Mode Data Capacity

4.4 Disk Rotation Mechanism

(Table 4.3-1) 1MB mode data capacity

Tracks/disk 160 160

Data capacity

k bytes/disk 500 1,000

Formatted

16 sectors/track

k bytes/trac 2.048 4.096

k bytes/disk 327.68 655.36

9 sectors/track

k bytes/disk 368.64 737.28

5 sectors/track

k bytes/disk 409.6 819.2

(Table 4.4-1) Disk Rotation Mechanism

Spindle motor DC brushless motor

Spindle speed 2MB/1MB mode 300rpm

1.6MB mode 360rpm

Motor servo method Frequency servo by ceramic oscillator Motor/spindle connection Motor shaft direct

Disk speed The same as the spindle speed.

Long term speed variation (LSV) ±1.5% or less Instantaneous speed variation (ISV) ±2% or less

Start time 480ms or less

Average latency 2MB/1MB mode 100ms

1.6MB mode 83.3ms

Speed change time 480ms or less (300rpm ↔ 360rpm)

Ready waiting time 505ms or less for motor on

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4.5 Index Detection

4.6 Track Construction

4.7 Magnetic Head

(Table 4.5-1) Index Detection

Number of index 1 per disk revolution

Detection method Rotor detection of spindle motor by Hall

element or FG output.

Detection cycle 2MB/1MB mode 200ms ±1.5%

1.6MB mode 166.7ms ± 1.5%

Index burst detecttion timing error (with specified test disk)

300rpm ±400µs or less

360rpm ±340µs or less

(Table 4.6-1) Track Construction

Track density 5.3 tracks/mm (135tpi)

Track pitch 187.5µm

Number of cylinders 80 cylinders

Number of tracks 160 tracks/disk

Outermost track radius (track 00) Side 0 39.500mm (1.5551 in) Side 1 38.000mm (1.4961 in) Innermost track radius (track 79) Side 0 24.6875mm (0.9719 in)

Side 1 23.1875mm (0.9129 in)

Positioning accuracy ±15µm or less, with specified test disk

(Track 40, 23 ± 2°C, 45 ~ 55%RH, horizontal)

(Table 4.7-1) Magnetic Head

Magnetic head Read/write head with erase gap, 2 sets Effective track width after trim erase 0.115 ± 0.008mm (0.0045 ± 0.0003 in) Read/write gap azimuth error 0° ± 18’, with specified test disk

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4.8 Track Seek Mechanism

4.9 Window Margin and Others

(Table 4.8-1) Track Seek Mechanism

Head position mechanism Stepping motor and lead screw

Stepping motor 4-phase, 20 steps per revolution

Stepping motor drive 2 steps per track Track 00 detection method Photo-interrupter

Track to track time 3ms (excludes settling time, refer to item. 8.3.4) Settling time 15ms or less (excludes track to track time) Average track seek time 94ms (includes settling time)

(Table 4.9-1) Window Margin and Others Window Margin (with specified test disk, MFM method , PLL separator)

2MB/1.6MB mode 300ns or more

1MB mode 600ns or more

Recommendable write pre-compensation

2MB mode ±125ns

1.6MB/1MB mode 0 ~ ±125ns

Head load mechanism Not equipped (The FDD becomes head load condition whenever a disk is installed.) File protect mechanism Detection of write inhibit hole by switch Disk detection mechanism Detection of disk installation by switch Disk inserting force 6.86N (700g) or less at the center of disk

Disk ejecting force 13.73N (1400g) or less

Acoustic noise at 50cm 50dBA or less at 3ms or 4ms seek operation Disk type descriminating mechanism Detection of HD hole by switch

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5. ENVIRONMENTAL CONDITIONS

(Table 5-1) Environmental Condition

Operating Storage Transportation

Ambient temperature 4 ~ 51.7°C (39 ~ 125°F) –22~60°C (–8 ~ 140°F) –40 ~ 65°C (–40 ~ 149°F)

Temperature gradient 20°C (36°F) or less per

hour 30°C (54°F) or less per

hour Relative humidity 20 ~ 80%

(no condensation) Max.

wet bulb temperature shall be 29.4°C (85°F)

5 ~ 90%

wet bulb temperature shall be 40°C (104°F)

5 ~ 95%

wet bulb temperature shall be 45°C (113°F)

Vibration

14.7m/s² (1.5G)I or less (10 ~ 100Hz, 1 octave/

min sweep rate)

——

19.6m/s² (2G) or less (10 ~ 100Hz, 1/4 octave/

min sweep rate) 9.8m/s² (1.0G) or less

(100 ~ 200Hz, 1 octave/

min sweep rate) 4.9m/s² (0.5G) or less (200 ~ 600Hz, 1 octave/

min sweep rate)

Shock

Write & read: 49m/s² (5G)(11ms, 1/2 sine

wave) or less —— 686m/s² (70G)

(11ms, 1/2 sine wave) or less

Read only: 98m/s² (10G)(11ms, 1/2 sine

wave) or less ——

Altitude

–300m (–980feet) ~

5,000m (16,400feet) ——

Notes: The above requirements are applied for the FDD without shipping box.

When a long period is required for transportation such as by ship, storage environmental conditions should be applied.(JIS-Z0200)

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6. RELIABILITY

(Table 6-1) Reliability

MTTF 30,000 power on hours or more (for typical operation duty)

MTTR When failure, the FDD should be replaced in unit of the drive and not repaired in unit of parts or assemplies.

Design component life 5 years

Disk life 3 × 10⁶ passes/track or more

Disk insertion 1.5 × 10⁴ times or more Seek operation 1 × 10⁷random seeks or more

Preventive maintenance Not required (for typical operation duty)

Error rate

Soft error 1 or less per 10⁹ bits read

A soft (recoverable) error means that it can be recoverred correcty within three retries.

Hard error 1 or less per 10¹² bits read

A hard (unrecoverable) error means that it cannot be recovered correstly within three retries. However, it is recommended to be followed by a recalibration to track 00 and four additional retries.

Seek error 1 or less per 10⁶ seeks

A seek error means that it can seek to a target track within one retry including a recalibration to track 00.

Safety standard Approved by UL, CSA and TÜV (FD-235HG-C817 is not confirmed by TÜV.)

Electro-static dischange test 15kV (150pF, 330Ω)

No hard error and/or no component damage occur when the test is applied to the operator access area (front bezel area).

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7. POWER INTERFACE

7.1 Required Power

The following specifications are applied at interface connector of the FDD.

(1) DC +12V : Not required (2) DC +5V

(a) Voltage tolerance :±10% (4.5 ~ 5.5V)

(b) Allowable ripple voltage :100mVp-p or less (including spike noise) (c) Current and power consumption

(Table 7.1-1) Current and power consumption

Operating mode Average current Average power

Typ. Max. Typ. Max.

Stand-by 8mA 10mA 40mW 55mW

Read operation 0.30A 0.40A 1.50W 2.20W

Write operation 0.30A 0.40A 1.50W 2.20W

Seek operation 3ms 0.56A 0.66A 2.80W 3.63W

6ms 0.60A 0.70A 3.30W 4.18W

Seek operation peak 0.9A 1.0A 4.50W 5.50W

Spindle motor start 0.62A 0.70A 3.10W 3.85W

Notes:

1. Values of Typ. current and power are specified at 5.0V, while the values of Max. are at 5.5V (+10%) with a disk of large running torque.

2. Stand-by mode is defined at the stop condition of spindle motor and seek operation.

3. Seek operation peak means the operation during the settling (15ms) after the seek conpletion.

4. Rush current flows within 150ms after the motor start.

5. Short time peak current except for power-on surge is less than 1.0A.

6. Refer to item. 9.4 as to the current consumption profile.

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7.2 Power Interface Connector and Cable (1) Power interface connector

(2) Power interface cable: Any appropriate cables taking the maximum power consumption of the FDD will be acceptable.

(Table 7.2-1) Power interface connector FDD side connector I-PEX P/N 5201-003-0046F or equivalent

Pin numbers 4 pins

Protection method for mis-

connection Mechanical protection by the shape of connector housing Connector external view See Fig. 7.2-1.

Connector location See Fig. 3-1.

Power interface connections See Table 7.2-2.

Cable side matched

connector AMP P/N 171822-4 (natural color) or equivalent

Cable side matched pin AMP P/N 170204-2 (AWG#20 ~ 26, loose piece) or P/N 170262-2 (AWG#20 ~ 26, strip form) or equivalent

(Table 7.2-2) Power interface pin-assignment Power voltage Pin numbers

DC +5V 1

0V 2

(0V) 3

(No conection) 4

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(Fig. 7.2-1) Power interface connector external view Power interface connector Pin number

PCB Upper side

of the FDD

Rear view

Top view

FDD side

Cable side

Cable

4 3 2 1 4 3 2 1

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8. SIGNAL INTERFACE

8.1 Signal Interface Connector and Cable (1) Signal interface connector

(2) Signal interface cable Maximum cable length : 2m, by terminator of 1kΩ or less (For daisy chain connection, the total cable length should be less than 2m).

The longer the cable, the smaller the resistor value should be.

(Table 8.1-1) Signal interface Connector FDD side connector I-PEX P/N 5003-001-0346F or equivalent

Pin numbers and pin pitch 2.54mm (0.1 in) pitch, 34-pin block header (17-pin double rows, even number pins are upper side of the FDD).

Connector external view See Fig. 8.1-1.

Connector location See Fig. 3-1.

Cable side matched

connector FUJITSU, P/N FCN-747B034-AU/B (closed end) or -AU/O (daisy chain) or equivalent.

Note: It is recommanded to use a polarizing type connector with a projection on the center of the housing to avoid mis-connection. Refer to Fig. 8.1-1.

For such a polarizing connector, ∇mark of the connector housing may show pin No.34.

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(Fig. 8.1-1) Signal interface connector external view Upper side

of the FDD

Signal interface connector

Pin numbers

Lower side of the FDD

Projection (upper side) FDD side

signal interface connector

Cable side

signal interface connector Rear view

Top view Side view

2 34

2 1

34 33

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8.2 Electrical Charactristics

“Vcc” means +5V power voltage supplied to the FDD.

8.2.1 FDD side receiver and driver

The specification are applicable at the interface connector of the FDD.

8.2.2 Host side receiver and driver

(Table 8.2.1-1) FDD side receiver and driver

Interface driver/reciver See Fig. 8.2.2-1.

Electrical characteristics of receiver

Input signals (TTL level)

LOW level (TRUE) 0 ~ 0.7V

LOW level input current 5.9mA, Max. (Including terminator current)

HIGH level (FALSE) 2.2V ~ +5V power voltage

Terminator resistor value 1kΩ ±5%

Terminator (pull-up) resistor is connected to each input.

Electrical characteristics of driver

Output signals (Open collector driver)

LOW level (TRUE) 0 ~ 0.4V Driver sink current

capability 37mA, Max.

HIGH level (FALSE) Depending on host side terminator

(Table 8.2.2-1) Host side receiver and driver

Host side driver TTL, CMOS, etc.

Driver required sink current FDD input current × Number of daisy chained FDD Host side receiver TTL, CMOS, etc.

Terminator is required for each output signal line from the FDD.

Host side terminator resistor value Usually 1 ~ 2.2kΩ is used. (150Ω Min.)

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FDD PCB Ass’y

Strap block

Control & R/W LSI (Bi-CMOS)

DRIVE SELECT 0 DRIVE SLECT 1

DISK CHANGE/READY

Other input signals Other output signals

Terminators

0V FG

10P DS RY 12P

34P DC

HS HI

HO 2 FG

DS0

RY34 DC34

HA

Select

Ready Disk change

HD in

5V

HD sensor 0V

10 12

34

DS1

H02 H02

HD IN/HD OUT

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8.3 Input/Output Signals

In the following, input signals are those transmitted to the FDD while output signals are those transmitted from the FDD.

LOW level of the signals is TRUE unless otherwise specified.

Refer to Table 1-2 as to the signal needed in this specification.

8.3.1 DRIVE SELECT input signal

(1) Signal to select a specific FDD for operation in multiplex control.

(2) Only the DRIVE SELECT signal of the same number as of on-state strap is effective.

(3) All the input/output signals except for the MOTOR ON and MODE SELECT are valid after this signal is made TRUE. The time required to be valid is 0.5µsec, Max. including transmission delay time of the DRIVE SELECT signal through the interface cable.

(4) Refer to item. 12.1 as to the turn-on condition of the front bezel indicator.

(5) Refer to item. 11. and Table 1-2 as to the strap setting and the selection of signal function.

8.3.2 MOTOR ON input signal

(1) Level signal to rotate the spindle motor.

(2) The spindle motor reaches to the rated rotational speed (2MB/1MB mode: 300rpm, 1.6MB mode:

360rpm) within 480ms after this signal is made TRUE.

(3) The rotational speed switchable between 360rpm and 300rpm according to the MODE SELECT signal while a high density (2HD) disk is installed.

(4) Refer to item. 11.2 as to the rotational condition of the spindle motor.

8.3.3 DIRECTION SELECT input signal

(1) Level signal to define the moving direction of the head when the STEP line is pulsed.

(2) Step-out (moving away from the center of the disk) is defined as HIGH level of this signal. Conversely, step-in (moving toward the center of the disk) is defined as LOW level of this signal.

(3) The signal shall maintain its level for 0.8µs, Min. prior to the trailing edge of the STEP pulse. Refer to Fig. 9.2-1.

8.3.4 STEP input signal

(1) Negative pulse signal to move the head. The pulse width shall be 0.8µs or more and the head moves one track space per one pulse.

(2) The access motion (head seek operation) is initiated at the trailing edge of the STEP pulse and completes within 18ms after starting the access including the settling time.

(3) For the subsequent motion in the same direction, the STEP pulses should be input with the interval of 3ms or more, while the pulses should be input with the interval of 4ms or more for a direction change.

Refer to Fig. 9.2-1.

STEP pulses less than 3ms interval for the same direction or less than 4ms interval for a direction change may cause seek error.

(4) STEP pulses are ignored and the access motion is not initiated when one of the following conditions is satisfied.

(a) The WRITE PROTECT signal is FALSE and the WRITE GATE signal is TRUE.

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(2) The FDD is set to write mode when the following logical expression is satisfied.

WRITE GATE * DRIVE SELECT * WRITE PROTECT

(3) This signal shall be made TRUE after satisfying all of the following conditions.

(a) 18ms has been passed after the effective receival of the final STEP pulse.

(b) 100µs has been passed after the level change of the SIDE ONE SELECT signal.

(4) The following operations should not be done at least 650µs after this signal is changed to FALSE.

(a) Make the MOTOR ON signal FALSE.

(b) Start the head seek operation by the STEP pulse.

(c) Make the DRIVE SELECT signal FALSE.

(d) Change the level of the SIDE ONE SELECT signal.

(e) Change the level of the MODE SELECT signal.

8.3.6 WRITE DATA input signal

(1) Negative pulse signal to designate the contents of data to be written on a disk. The pulse width should be 0.1µs through 1.1µs and the leading edge of the pulse is used.

(2) WRITE DATA pulses are ignored while either of the following conditions is satisfied.

(a) The WRITE GATE signal is FALSE.

(b) The WRITE PROTECT signal is TRUE.

(3) This signal should be input according to the timing in Fig. 8.3-2.

It is recommended to stop the input of the WRITE DATA pulses during the read operation in order to avoid harmful cross talk.

8.3.7 SIDE ONE SELECT input signal

(1) Level signal to designate which side of a double sided disk is used for reading or writing.

(2) When this signal is HIGH level, the magnetic head on the side 0 surface (lower side) of the disk is selected, while the magnetic head on the side 1 surface (upper side) is selected when this signal is LOW level.

(3) The READ DATA pulse on a selected surface is valid more than 100µs after the change of this signal level.

(4) Write operation (the WRITE GATE signal is TRUE) on a selected surface shall be started more than 100µs after the change of this signal level.

8.3.8 TRACK 00 output signal

(1) Level signal to indicate that the head is on track 00.

(2) This signal is valid more than 2.8ms, after the effective receival of the STEP pulse.

8.3.9 INDEX output signal

(1) Negative pulse signal to indicate the start point of a track and one index pulse per one disk revolution is

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• 480ms approx, have been passed after the density mode is switched between 1.6MB (360rpm) and 2MB (300rpm) using the MODE SELECT input signal.

(b) Seek-complete means the state that 15.8 ~ 17.9ms has been passed after the trailing edge of the final STEP pulse.

(3) Fig. 8.3-1 shows the timing of this signal. Leading edge of the pulse shall be used as the reference and pulse width is 1.5ms through 5ms.

8.3.10 READ DATA output signal

(1) Negative pulse signal for the read data from a disk composing clock bits and data bits together.

(2) Fig. 8.3-3 shows the timing of this signal. Pulse width is 0.15µs through 0.8µs and the leading edge of the pulse shall be used as the reference.

(3) READ DATA pulse is output when the following logical expression is satisfied.

Read data detection * DRIVE SELECT * Write operation * Ready state * Seek-complete Notes: (a) Refer to item. 8.3.9 as to the ready state.

(b) Write operation is the state while the WRITE GATE input signal is FALSE and erase delay time has been passed after the WRITE GATE signal changed to FALSE.

(c) Refer to item. 8.3.9 as to the seek-complete.

(4) Output pulse is valid while all of the following conditions are satisfied.

(a) 18ms has been passed after the effective receival of the final STEP pulse.

(b) 100µs has been passed after the level change of the SIDE ONE SELECT signal.

(c) 650µs (2MB mode) or 590µs (1.6MB mode) or 690µs (1MB mode) has been passed after the WRITE GATE signal is changed to FALSE.

8.3.11 WRITE PROTECT output signal

(1) Level signal to indicate that the write inhibit hole of an installed disk is open.

(2) When this signal is TRUE, data on the disk are protected from miserasing and write operation is inhibited.

8.3.12 DISK CHANGE output signal

(1) Level signal to indicate that a disk in the FDD is ejected.

(2) Refer to item. 11.as to the strap setting for this signal output.

(3) This signal changes to TRUE when either of the following conditions is satisfied.

(a) Power on.

(b) A disk is removed.

(4) The signal returns to FALSE when both of the following conditions are satisfied. Refer to Fig. 8.3-4.

(a) A disk has been installed.

(b) A STEP command is received when the DRIVE SELECT signal is TRUE.

8.3.13 READY output signal

(1) Level signal to indicate that the FDD is in ready state (refer to item. 8.3.9) for read and write operations.

(2) Refer to item. 11. as to the strap setting for this signal output.

(3) Required time for this signal to be TRUE after the start of the spindle motor is 505ms, Max.

(4) When a motor-on command is made FALSE, this signal is also changed to FALSE within 0.3ms.

8.3.14 Input/Output sgnal for density mode setting (MODE SELECT)

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8.3.14.1 Method for switching the density mode between HIGH DENSITY and NORMAL DENSITY

(1) Interface signal is not used between the FDD and host-controller.

Density mode of the FDD and host system are determined independently.

(2) Density mode of the FDD is automatically set by discriminating the HD hole of an installed disk. If the density mode of the FDD is not coincident with that of the host controller, data errors always occur at read operation.

8.3.14.2 Method for switching the density mode between 2MB mode and 1.6MB mode The density mode of 2MB or 1.6MB is set by the MODE SELECT input signal from host controller.

8.3.15 NO CONNECTION (NC)

The NC pins are electrically isolated from any other circuit in the FDD.

(Table 8.3.14.2-1) Method of the MODE SELECT signal

FDD density mode 1MB mode 1.6MB mode 2MB mode

Set by MODE SELECT signal

LOW: 1.6MB Not related to MODE SELECT signal

LOW level HIGH level

HIGH: 1.6MB HIGH level LOW level

(26)

8.3.16 Treatment of not-used signals

If some of the provided input/output signals are not necessary for your application, keep the unused signal lines open or pull up by an appropriate resistor value (refer to item. 8.2.2) at the host side.

(Fig. 8.3-1) INDEX timing

(Fig. 8.3-2) WRITE DATA timing (MFM method)

Density mode rpm t1 t2 t3

2MB mode 300 2µs, Nom. 3µs, Nom. 4µs, Nom.

1.6MB mode 360 2µs, Nom. 3µs, Nom. 4µs, Nom.

1MB mode 300 4µs, Nom. 6µs, Nom. 8µs, Nom.

INDEX

1.5 ~ 5ms

197 ~ 203ms (300rpm) 164.2 ~ 169.2ms (360rpm)

~

1 1 0 0 1 0 1

~

~ ~

WRITE GATE

WRITE DATA

0.1 ~ 1.1µs 8µs Max.

2F

t1 4/3F t2

4/3F t2

1F t3

Max.

8µs

*

* : ±0.5% *

Magnetization on disk

(27)

Density mode rpm t4 t5 t6 t7

2MB mode 300 2µs, Nom. 3µs, Nom. 4µs, Nom. ±350ns

1.6MB mode 360 2µs, Nom. 3µs, Nom. 4µs, Nom. ±350ns

1MB mode 300 4µs, Nom. 6µs, Nom. 8µs, Nom. ±700ns

(Fig. 8.3-3) READ DATA timing (MFM method) READ DATA

0.15 ~ 0.8µs

2Ft4 4/3F

t5 4/3F

t5 1F

t6

1 1 0 0 1 0 1

Magnetization on disk

Power on Disk eject Disk install

Installed Ejected

Installed

1µs, Max.

Disk installation STEP

DISK CHANGE

Note: To simplify the timing chart, the DRIVE SELECT signal is assumed always TRUE in the above figure.

(28)

9. CONTROL SEQUENCE

9.1 Power-on

(1) Protection against power on and off

(a) In the transient period when the +5V power is lower than 3.5V, the FDD is protected against miswriting and miserasing whatever the state of input signals are.

(b) Except for the condition of item (a), the FDD is protected against miswriting and miserasing as long as the WRITE GATE input signal does not change to TRUE.

(2) Power reset time in FDD :Less than 400ms, including auto-recalibration

(Fig. 9.1-1) Power on sequence 3.5 ~ 4.4V

+5V power Valid interface signals

Internal miswrite protection

Power resetting

400ms, Max. with auto-recalibration Valid

(29)

9.2 Seek Operation

Seek operation can be done independently of the spindle motor rotation.

(Fig. 9.2-1) Seek operation timing

t1 t1 t1 t1

Step-out

Step-in

t1 t2 t1 t1 t1

t1

t3 3ms 4ms, Min. 3ms

Min.

2.8ms, Max. 1µs, Max.

DRIVE SELECT

DIRECTION SELECT STEP

WRITE GATE TRACK 00

t1 ≥ 0.8µs t2 ≥ 2µs t3 ≥ 560µs (1.6MB mode) or 650µs (2MB/1MB mode)

~ ~

(30)

9.3 Read Write Operation

650µs, Max. (2MB mode) 590µs, Max. (1.6MB mode) 690µs, Max. (1MB mode)

(tE, Min.)

(tE Min.)

500ms, Max. 0.3ms, Max.

Valid

15.8~17.9ms (Seek-complete)

3ms, Min. tE, Min.

8µs, Max. 8µs, Max.

18ms, Min.

(tE, Min.) 0, Min.

100µs, Min.

0, Min.

100µs, Max.

Valid Valid Valid Valid

15.8~17.9ms (Seek-complete) Valid

Valid 0.5µs, Max.

MOTOR ON

DRIVE SELECT

READY

INDEX

STEP

WRITE GATE

WRITE DATA

SIDE ONE SELECT

READ DATA

Other input signals Other output signals

tE = 560µs (1.6MB mode) or 650µs (2MB/1MB mode)

(31)

9.4 Current Consumption Profile

mA

High current (350ms, Max.)

+5V typical average current 800

600 400 200 0

15ms

from the last step

Initial reset

Auto-recalibration Stand

-by Stand

-by

Auto-chucking

Motor start

Read Seek Read Write Read Stand-by Drive selected Diskinstallation

Power on FDD status

Motor-on command DRIVE SELECT STEP

Spindle motor power Steppin motor power Read write amp. power Logic power

Start rush

on

0 0 off

on

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(1) Stand-by mode

When both of the following conditions are satisfied, FDD goes to the stand-by mode (low power consumption mode).

(a) The spindle motor stops.

(b) Not in the seek operation (including the settling time).

Note: In the stand-by mode, the FDD can immediately respond to a command from host controller with no restriction.

If the polling operation of the DRIVE SELECT line is done in the stand-by mode, current flows intermittently and +5V current slightly increases.

(2) Simultaneous operation of motor start and seek

If a seek operation is done during the start-up of the spindle motor, or if the motor starts during the seek operation, +5V current at motor start increases by 0.55A, Max. from the value in Table 7.1-1.

Stepping motor is energized at high power from the first STEP to 15msec after the last STEP.

(3) +5V current increases for 15ms after a lapse of 500ms by engergizing of the motor.

(33)

10. FRAME GROUNDING

(1) The FDD frame is electrically connected to DC 0V by the FG strap on the main PCBA. (See Fig. 10-1) (2) If it is required to separate the FDD frame from DC 0V, remove the FG strap. However, the FDD frame

must be electrically connected to DC 0V by some other method when the FDD is tested alone.

(3) If it is required to connect the FDD frame to the host side by other cabling method, M2.6 tapped hole at the rear side of the FDD can be used. (See Fig. 3-1).

(Fig. 10-1) Frame ground internal connection PCBA mounting screw

Interface connector (0V) FDD

Main PCBA

Frame ground tapped hole (M2.6)

FG strap

(34)

11. CUSTOMER SELECTABLE STRAPS

11.1 Function Summary of Straps

The FDD is equipped with the following selectable straps on the main PCBA. Insertion of a short bar onto the post pin is defined as the on-state of the strap. Refer to Table 1-1 in item. 1. as to the strap setting at delivery and selectable straps.

Notes : *straps overlap with other strap posts. Insert a short bar according to your priority.

11.2 DS0/DS1

(1) In the multiplex control, these straps designate the address of the FDD.

(2) By the combination with the DRIVE SELECT 0 ~ 1 signals, two addresses, Max. can be designated.

Refer to Fig. 8.2.2-1 and Table 11.1-1.

11.3 HA Strap

The HA strap is one for automatically setting the FDD to the 1MB mode or high density mode (1.6MB mode or 2MB mode) according to the type of a disk installed.

This should be always set to ON for using the FDD in the 2MB/1.6MB/1MB modes.

11.4 RY34/DC34 Straps

(1) RY34 strap is used to output the READY signal on interface pin No.34.

(2) DC34 strap are used to output the DISK CHANGE signal on interface pin No.34, 2.

(Table 11.1-1) Function summary straps

Strap Function

DS0 DRIVE SELECT 0 input on pin 10 DS1 DRIVE SELECT 1 input on pin 12

*RY34 READY output on pin 34

*DC34 DISK CHANGE output on pin 34

*HA Density set automatically

FG Short between FDD frame and DC 0V

FG DS 12 DC HI 2

34P HS HO

RY 10

0V FG

DS1 DS0

RY34

DC34 HA

1

2

A B C D E F

Strap post layout HO2

H12

(35)

12. TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR

12.1 Front Bezel Indicator

Two types of indicator (LED) turn-on condition are offered for selection using the IR strap.

However, the indicator keeps off until 3.1ms has passed after the DRIVE SELECTion to avoid the polling operation of the DRIVE SELECT signal.

12.2 Spindle Motor

The spindle motor rotates while the MOTOR ON signal is TRUE. However, the spindle motor does not rotate at any condition while no disk is installed.

TEAC FD-235HG-C805/C817/C897 MICRO FLOPPY DISK DRIVE SPECIFICATION